Re: "Fix ATAPI transfer lengths" causes CD writing regression

O> Hmmm.... reading ide-cd.c::cdrom_pc_intr(). OIC, ide-cd is dealing with
this problem by draining PIO after BMDMA engine is done. This is
possible for BMDMA engines as they simply step out when the SG entries
are exhausted; then, the interrupt handler kicks in and drains the
left-over using PIO. This just isn't possible with more modern DMA engines.

Its not possible with old ones either - its a bug not a feature and is
why there is special casing for stuff like promise where this hangs the
chip.

Alan
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